Extend devstack support to Red Hat-based distros
Extend devstack support to Red Hat-based distros

Congress devstack assumes system is Debian-based. That results in
default-jre package not found under Red Hat-based distros.
JRE package name under other distros may differ, too. Explicitely abort
deployment for untested distros.

Closes-Bug: #1693216
Change-Id: Id25931946da1f97e08bf9aeb5f6b7668bfbf48a1

openstack/congress,openstack/congress